ames: don't overwrite lane if already direct

This is why basically all packets are going through the galaxies right
now.  Most of the time, the flow right now is:

* talking to ~dopzod but don't know where it is, so ask ~zod to forward,
  which it does

* ~dopzod responds both directly (on the origin lane) and through ~zod

* (if NAT, the direct response doesn't get back, but the one through
  ~zod does. Then you respond directly to ~dopzod because their lane
  piggybacked on the response. ~dopzod responds both directly and
  through ~zod, and the story picks up the same as if you weren't behind a
  NAT)

* now you have a direct lane to ~dopzod, so all is well.

* now the duplicate response from ~dopzod through ~zod comes in (takes a
  little longer because it's bouncing off ~zod), resetting your lane to
  "provisional"

* since your lane is provisional, you send your next packet both
  directly and through ~zod

* GOTO 2

This change says "if I already have a direct lane, don't overwrite it
with a provisional one". This way, the only way the direct lane can be
overwritten is if they stop responding on it (cleared on "not
responding; still trying").

I also added |- to +send-blob to make |ames-verb %rot less confusing.

bin/solid.pill

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:7352e0e38fd21e291b66c607b3971b448a6d738fece48a60c8158b7be3678489
-size 9502771
+oid sha256:fdb2fce980015e3789b0bf5a4e90a468227e6b2a0c97a7448de6edb6cde175c9
+size 9503162

pkg/arvo/sys/vane/ames.hoon

@@ -1309,7 +1309,10 @@
     ?>  =(rcvr-life.shut-packet our-life.channel)
     ::  non-galaxy: update route with heard lane or forwarded lane
     ::
-    =?  route.peer-state  !=(%czar (clan:title her.channel))
+    =?  route.peer-state
+        ?&  !=(%czar (clan:title her.channel))
+            !=([~ %& *] route.peer-state)
+        ==
       ?~  origin.packet
         `[direct=%.y lane]
       `[direct=%.n u.origin.packet]
@@ -1689,6 +1692,7 @@
     |=  [=ship =blob]
     ::
     %-  (trace rot.veb |.("send-blob: to {<ship>}"))
+    |-
     |^  ^+  event-core
         ::
         =/  ship-state  (~(get by peers.ames-state) ship)